Clamp for boatbuilding



Oct. 20, 1942. L R BUR H 2,299303 CLAMP FOR BOAT BUILDING Filed March 25, 1941 ATTORNEY- Patented Oct. 20, 1942 UNITED STATES PATENT OFFICE CLAMP FOR BOATBUILDING Loren P. Burch, Aberdeen, Wash.

Application March 25, 1941, Serial No. 385,081

4 Claims.

This invention relates generally to boat building and particularly to a clamp for use in the construction of boats from ply wood.

The main object of this invention is to construct a clamp for hOlding chine strips within the forms upon which the boat is constructed, as more fully set forth in my United States Patent No. 2,232,313.

The second object is to construct a clamp of the class described which will hold the chine strips securely in position within the forms or molds and will also permit the easy removal of the boat from the forms.

I accomplish these and other objects in the manner set forth in the following specification as illustrated in the accompanying drawing, in which:

Fig. 1 is a transverse section through a form with the inner chine strip in place and with the clamp omitted.

Fig. 2 is a transverse section through a portion of a mold and a corresponding portion of the boat being formed showing a clamp in a chine holding position.

Fig. 3 is a fragmentary section taken along the line 33 in Fig. 2.

Fig. 4 is a fragmentary plan taken along the line 44 in Fig. 2.

Fig. 5 is similar to Fig. 2 but showing the clamps in a chine releasing position.

Similar numerals refer to similar throughout the several views.

Referring in detail to the drawing, there is shown a form H] which is reinforced at suitable intervals by ribs l I. the reception of the inner chine strips l3. A section of ply wood or other material 14 is bent around the form ID, usually in th presence of moist heat.

The function of the clamp which I am about to describe, is to hold the strip I3 securely in place until it is desired to remove the boat M from the form l0. In order to make this possible, after the strip I3 is secured to the boat I4, it is necessary to relieve the slots I2 along the edge l5 as indicated in order to permit the boat M to be moved parallel to the vertical sides I6.

Referring particularly to the clamp, it will be seen to consist of a fixed side I1 which is secured parts to the angle bracket l8 by the bolt I9, and the movable side 20 which is provided with a slot 2| to receive the bolt 22 which also passes through the angle bracket [8.

Sides H and 20 are provided with strip engag- The form 0 has slots I 2 for ing jaws 23 and 24 which are adapted. to engage 55 opposite sides of the strip [3. The ends 25 and 26 of the sides I! and 20 can be urged apart by the clamping screw 21 which is threaded through the side 20 and is provided with a hand crank 28 on one end and a washer 29 near its opposite end 30 which is free to slide in the slot 3| formed in the edge of the side IT.

The angle bracket [8 is secured to the form In by means of bolts 32 or in any other convenient manner.

The operation of the device is as follows:

Assuming that the strips 13 are in place in the respective slots l2 and that the shell or body of the boat l6 has been formed into the position as shown in Figs. 2 and 5, it is desirable to hold the strips [3 fixed in their respective slots [2. In order to do this one need merely to turn the crank 28 in a direction to urge their ends 25 and 26 apart which naturally urges the jaws 23 and 24 together, clamping the strip l 3 between same and thereby facilitating the fastening of the strip [3 to the side M or to a second chine strip which is placed on the outer side of the boat Hi.

When the boat I6 is ready to be removed from the form It], it is only necessary to release the side 20 by reversing the movement of the crank 28 and permitting the side 20 to move downwardly to the position shown in Fig. 5. That is, permitting the boat to be moved vertically carrying with it the attached chine strips [3.

Obviously the particular details employed in the construction of this clamp are of lesser importance than the fact that the use thereof permits the free movement of the boat upwardly on release, and requires only a small amount of material in order to satisfactorily accomplish the desired purpose during the chine stripping operation.

I claim:

1. A clamp for chine strips in ply wood boat building consisting of a slotted form adapted to hold a chine strip and a pair of jaws mounted in said form adapted to hold the chine strip, one of said jaws being longitudinally movable for the purpose of permitting the chine strip to be moved diagonally off of its slot.

2. In a clamp of the class described, the combination of a form for the interior of a boat, said form having slots formed therein for the reception of chine strips, a fixed jaw registering with one side of a chine strip slot and a pivotally and slidably mounted jaw adapted to engage the opposite side of a chine strip disposed within said chine strip slot and means for urging the chine engaging end of the jaws together by urging the chine strip, a transverse opening formed through the curved portion of said form having a pair of substantially parallel jaws projecting there through adapted to hold a chine strip between same, one of said jaws being fixed and the other 5 pivoted in a manner to afford slidability to said jaws as well as to vary its angularity with relation to the opposite jaw for the purpose of changing the distance between the strip engaging jaws, and a screw between the opposite ends of said 10 jaws adapted; to urge the portions thereof apart.

LOREN P. BURCH. 

